Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2009. / Committee Chair: William Singhose; Committee Member: Nader Sadegh; Committee Member: Wayne J. Book. Part of the SMARTech Electronic Thesis and Dissertation Collection.

Thesis (M.S.)--University of Wisconsin--Madison, 1964. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 68.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1983. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--University of Wisconsin--Madison, 1963. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 57).

This diploma thesis deals with the electgrical cabel hoist 5t,which will be placed in the hall. The aim of the calculating and draving documentation is to design and make control of drivers and travel. , machine components of travel height including the calculation and choice of steel rope. In material design I come out not only from CSN and german DIN standars , but also literature, which deals of cranes.

Thesis (PhD (Civil Engineering))--University of Stellenbosch, 2007. / The current codes of practice for the design of structures which were studied during this investigation do not explicitly account for the flexibilities and interactions of the Electric Overhead Travelling Crane (EOHTC) and the crane support structure. This leads to analysing the EOHTC and the gantry structure as a decoupled system for ease of computation. Thus, the interaction of the various components of the EOHTC and gantry structure is ignored, which may result in an incorrect assessment of the forces computed in the gantry structure’s members. This led to a study to determine the effects of a EOHTC on the gantry structure. The research was conducted through a series of limited experimental tests and extensive advanced Finite Element Analysis (FEA) simulations. This resulted in developing a computationally efficient FEA model of the full scale experimental EOHTC testing facility in the structural engineering laboratory at Stellenbosch University. The FEA model was developed to conduct simulations for the various load models, namely, vertical wheel load, horizontal longitudinal load and the horizontal lateral load models, as prescribed by the various codes. The research was then focussed at determining the maximum end buffer impact force responses when the crane runs into the end stops. The other load models were investigated by another researcher using the same FEA model. The results from the experimental tests were used to calibrate the FEA simulations. This proved exceptionally challenging due to the various structural response phenomena which occur during the impact of the crane against the end stops. A good correlation between the experimental values and the values predicted by the FEA simulations was achieved for the first impact. Modal analysis and modal superposition methods of analysis were used to determine the effect of the modes of vibration on the structural response to the end buffer impact. A FEA sensitivity analysis was conducted on a set of identified parameters which have a significant effect on the structural response to the end buffer impact. The maximum end buffer impact force was determined for a chosen level of reliability based on the responses from the sensitivity analysis using the Lagrange Multiplier method. These maximum end buffer impact forces are then compared with the forces prescribed by the codes. SABS 0160 slightly underestimates, while SANS 10160 severely overestimates the end buffer impact force obtained from the constraint optimization technique for a target level of reliability of β =3.

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Thesis (MScEng)--University of Stellenbosch, 2003. / ENGLISH ABSTRACT: The aim of this thesis is to investigate the wheel/rail/girder interaction of overhead cranes. Three components of the above mentioned interaction system are considered. • The contact interaction between the crane wheel and the rail and its effects on the rail stresses. • The stress distribution in thin webbed rails and the location of critical stresses in the rail. • The load distribution between the rail foot and the crane girder with the inclusion of elastomeric pads. The steps followed for the purpose of this investigation were: • The creation of a numerical wheel-rail interaction model with the finite element method. • The experimental and analytical verification of the numerical results. • An analysis of the wheel/rail/girder interaction system variables on the basis of the numerical results. The following conclusions were drawn from the investigation: • The variables with the greatest influence on the wheel-rail contact patch shape, size and critical stress are the crane wheel diameter and the railhead curvature radius. • It is the position of the above mentioned contact patch relative to the rail symmetry plane, rather than the wheel-rail contact patch size, shape and critical stress, that has a significant influence on the rail stress distribution as a whole. • Critical stresses in thin webbed rails are found at the web-foot and web-head junctions. • The load distribution between the rail foot and the girder, in case elastomeric pads are included, can be described using the beam on elastic foundation theory. / AFRIKAANSE OPSOMMING: Die doél van hierdie tesis is om die interaksie tussen die wiel, die spoor en die ondersteunende balk van oorhoofse krane te ondersoek. Die klem val op die interaksie van drie komponente van bogenoemde sisteem nl:. • Die kontak: interaksie tussen die kraanwiel en die spoor en die gevolglik effekte op die spanningsverdeling in die spoor. • Die spanningsverdeling in kraanspore met dunwandige webbe en die lokasie van kritieke spannings. • Die spanningsverdeling tussen die onderste spoorflens en die bo-flens van die ondersteunende balk in die geval dat 'n elastomeriese strook tussen bogenoemde flense ingesluit word. Die stappe vir die ondersoek was as volg: • Die skepping van 'n numeriese wiel-spoor interaksie model met die eindige element metode. • Die eksperimentele en analitiese verifikasie van numeriese resultate. • Die analise van die wiel/spoor/ondersteunende balk sisteem veranderlikes gebaseer op numeriese resultate. Die belangrikste resultate van die ondersoek was dat: • Die veranderlikes met die grootste invloed op die grote, vorm en kritieke spannings van die wiel-spoor kontak area is die kraan wiel radius en die radius van die spoor se bo-vlak kromming. Dit is die posisie van bogenoemde kontak area relatieftot die simmetrievlak van die spoor, in plaas van die wiel-spoor kontak area grote, vorm ofkritieke spanning, wat 'n deurslaggewende invloed op die spanningsverdeling in die kraanspoor het. • Kritieke spannings in spore met dunwandige webbe word aan die bokant en onderkant van die spoor web aangetref. • Die spanningsverdeling tussen die onderste spoor flens en die bo flens van die ondersteunende balk kan, in die geval dat 'n elastomeriese strook tussen bogenoemde flense ingesluit word, met die gebruik van balk op elastiese fondament teorie beskryf word.

A research project submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in partial fulfillment of the requirements for the degree of Master of Science. / The problem of scheduling with sequence-dependent set-up times in a dynamic environment is investigated by studying how various dispatching rules perform when used to schedule two cranes. Motivated by a practical scheduling problem, the effect on production by delays due to the conflicts that result between cranes is examined. The problem is formalized, and it is shown that it can be classified as a problem of scheduling with both sequence-dependent set-up and processing times. The effectiveness of simple dispatching procedures that are used in machine scheduling and for the control of automated guided vehicles is studied, using a simulation of a crane aisle with jobs arriving dynamically. In addition, a dispatching rule, which explicitly uses information regarding the state of the second crane, is examined. The simulation results confirm the non-dominance of certain dispatching procedures, and show how performance is improved as the rules are provided more information regarding the state of the scheduling environment. It is shown that when there are sequence-dependent processing times, a scheduling heuristic that uses global information does significantly better than more commonly used local heuristics. / AC2017

Thesis (doctoral)--Königliche Techische Hochschule zu Berlin, 1904. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.